PLEASE Help. The engine in my mothers jeep is a 2001 jeep grand cherokee 4.0L. We drove to myrtle beach from northern NJ. The engine is overheating when sitting in still traffic because the fan in not working. I am not getting any codes. I know in that system there is a fan relay under the passenger side headlight. I have no tools which sucks.I had to use a knife to cut threw the front just to get to the relay. In the morning im going to try to get test leads from somewhere to test if the fan in the problem. Has anyone ever had a problem with this or know anything thanks ........

The relay is indeed a many times occuring problem. You could put just straight 12 V from the battery to the fan to see if the problem is not there. Be carefull though to not to be hit by the fan blades.

I just went threw this awhile ago. If the fan does work,make sure the fan runs at all speeds after you change the relay otherwise you'll end up buying another relay & a fan. It took me two relays to figure it out.

For this model its in fact not just a simple relay, but a pulse width modulated relay, which receives its signal from the PCM and can let the fan run from low to high speeds. Later models have 2 relays which gives 2 fan speeds. This later model seems to be more reliable.

Im hoping tomorrow that i can take test leads to the fan to see if i can get the fan to spin. If it does spin im not going to know what to do. Its hard to fix stuff with limited tools. Does anyone know where the fan disconnects? Or does anyone have a wiring diagram handy?

In my manual (its for the 2004 WJ) the cooling fan connector is at the left hand side of the radiator when standing in front of the car looking aft. Can't you borrow some tools from someone to fix the job?

I was able to get to advance to get enough tools to get the job done. It was 280 for the fan which i think was redicilus but you have to pay what the parts cost. It was 4 bolts for the fan shroud and the 3 bolts for the fan. for everyones information not a hard job but the 2 bottom bolts for the shroud was a PITA. you need about a 12in extension and a swivel ion a 1/4 in set and youll still be cursing the jeep out